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Your internal clock, or circadian rhythm, is closely connected to many forms of insomnia. Contrary to popular belief, circadian rhythm has more to do with the levels of light than the time of day. This internal clock is what tells us when to go to sleep, and when to wake up in thew morning.

It is this internal clock that is known as the circadian rhythm. Hormones secreted through out the day are governed by this internal clock, and so are body temperature and our level of mental alertness.

The circadian rhythm is partially responsible for us feeling sleepy or sluggish with low energy, certain times during the 24 hour cycle, and for having abundant energy other times during the cycle. Those with a sleeping disorder related to their circadian rhythm tend to feel tired when they should be alert and vice versa. Those working the night shift tend to suffer from this type of sleep disorder.

One of the biggest factors in regulating your circadian rhythms is how much exposure you get to very bright light, especially sunlight. When you don’t get enough light over a long period of time, such as during the winter, you may notice that you tend to feel more fatigued or have less energy when compared to the spring and summer.

Light therapy, using special types of light with specific wavelengths simulating natural light can be used to slowly reset the internal clock. The light therapy is easy and pleasant and requires 30-60 minutes of exposure in conjunction with a strict sleeping schedule. The light is usually delivered using specifically designed lights.

The time of day you use your light box is the most important thing to consider. The schedule would depend on your schedule and the type of insomnia you have.